<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Task Manager</title>
    <style>
        /* CSS样式可以在这里添加 */
        .waiting {
            background-color: lightblue;
        }
        .doing {
            background-color: lightgreen;
        }
        .status::before {
            content: "• • •";
            margin-right: 5px;
            font-size: 1.2em;
            color: gray;
        }
        .filter-buttons button {
            margin-right: 5px;
        }
    </style>
</head>
<body>

<div>
    <input type="text" id="taskInput" placeholder="Enter task">
    <button id="addTask">Add Task</button>
</div>

<div class="filter-buttons">
    <button id="showAll">Show All</button>
    <button id="showWaiting">Show Waiting</button>
    <button id="showDoing">Show Doing</button>
</div>

<table id="taskTable">
    <thead>
    <tr>
        <th>Status</th>
        <th>Task</th>
    </tr>
    </thead>
    <tbody>
    <!-- 表格行将在这里动态添加 -->
    </tbody>
</table>

<script src="js.js">
    // JavaScript代码将在这里编写
</script>

</body>
</html>